Pressure tuning of an ionic insulator into a heavy electron metal: An infrared study of YbS

M. Matsunami, H. Okamura, A. Ochiai, T. Nanba

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Optical conductivity [σ(ω)] of YbS has been measured under pressure up to 20 GPa. Below 8 GPa, σ(ω) is low since YbS is an insulator with an energy gap between a fully occupied 4f state and an unoccupied conduction (c) band. Above 8 GPa, however, σ(ω) increases dramatically, developing a Drude component due to heavy carriers and characteristic infrared peaks. It is shown that increasing pressure has caused an energy overlap and hybridization between the c band and 4f state, thus driving the initially ionic and insulating YbS into a correlated metal with heavy carriers.

Original languageEnglish
Article number237202
JournalPhysical review letters
Volume103
Issue number23
DOIs
Publication statusPublished - 2009 Dec 2
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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